Peter III (February 21, 1728 – July 17, 1762) was Emperor of Russia for six months in 1762. According to most historians, he was mentally immature and very pro-Prussian, which made him an unpopular leader. He was supposedly assassinated as a result of a conspiracy led by his wife, who succeeded him to the throne as Catherine II. After Peter gained the throne in 1762, he instantly incurred the nobles’s is pleasure by withdrawing from the Seven Years’ War and making peace with Prussia, in which Russia did not gain anything, in spite of Russia’s occupation of Berlin and virtual victory in the war. He formed an alliance with Prussia and planned an unpopular war against Denmark in order to restore Schleswig to his Duchy of Holstein-Gottorp. He also attempted to force the Russian Orthodox Church to adopt Lutheran practices.